Before working, disconnect connectors of ABS actuator and electric unit (control unit) or battery cable from the negative terminal.
Make sure there is no foreign material in the reservoir tank, and refill with new brake fluid.
Loosen bleed valve, depress brake pedal slowly to full stroke and then release it. Repeat the procedure every 2 or 3 seconds until the new brake fluid comes out, then close the bleed valve while depressing the pedal. Repeat the same work for each wheel.